How do you say congratulations in Latin?

There are a few ways to say "congratulations" in Latin, depending on the context:

Formal:

* Gratulor tibi! (I congratulate you!) This is a formal and direct way to express congratulations.

* Gratulationes tibi! (Congratulations to you!) This is a more traditional and slightly more poetic way to say it.

Informal:

* Feliciter! (Congratulations!) This is a short and informal way to express congratulations. It literally means "happily!"

* Bene factum! (Well done!) This is another informal way to say congratulations, especially when someone has achieved something difficult or challenging.

For a specific achievement:

* You can use a phrase like "Gratulor tibi de [achievement]" (I congratulate you on [achievement]) or "Feliciter propter [achievement]" (Congratulations on [achievement]).

The best way to choose the right phrase depends on the situation and your relationship with the person you are congratulating.